Locating Edges and Removing Ringing Artifacts in JPEG Images by Frequency-Domain Analysis

We present a method of locating edges in JPEG-coded images which operates in frequency space on the DCT coefficients. Applied to the quantized DCT coefficients of a block containing a straight edge, the method yields an equation for the edge in a fraction of the operations needed to dequantize and transform the coefficents to pixel values. As a sample application of this method, we present a technique for alleviating ringing artifacts in JPEG-coded images

[1]  Anthony Vetro,et al.  Edge map guided adaptive post-filter for blocking and ringing artifacts removal , 2004, 2004 IEEE International Symposium on Circuits and Systems (IEEE Cat. No.04CH37512).

[2]  Byung Cheol Song,et al.  Fast edge map extraction from MPEG compressed video data for video parsing , 1998, Electronic Imaging.

[3]  Irina Popovici,et al.  Custom-built moments for edge location , 2006, IEEE Transactions on Pattern Analysis and Machine Intelligence.

[4]  Y. Arai,et al.  A Fast DCT-SQ Scheme for Images , 1988 .

[5]  Bede Liu,et al.  Post processing transform coded images using edges , 1995, 1995 International Conference on Acoustics, Speech, and Signal Processing.

[6]  C.-C. Jay Kuo,et al.  Review of Postprocessing Techniques for Compression Artifact Removal , 1998, J. Vis. Commun. Image Represent..

[7]  I. K. Sethi,et al.  Convolution-Based Edge Detection for Image/Video in Block DCT Domain , 1996, J. Vis. Commun. Image Represent..

[8]  Irina Popovici,et al.  Locating Thin Lines and Roof Edges by Custom-Built Moments , 2006, 2006 International Conference on Image Processing.

[9]  Bo Shen,et al.  Direct feature extraction from compressed images , 1996, Electronic Imaging.

[10]  Chung J. Kuo,et al.  Adaptive postprocessor for block encoded images , 1995, IEEE Trans. Circuits Syst. Video Technol..